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P0303 Code Came Back


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3 replies to this topic

#1 Miner

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  • 26 posts

Posted November 3, 2010 at 06:00 pm

2002, T&C, 3.8. Changed the plugs with OEM, wires and coil.

P0303 Code came back again. Hooked up the scan tool and received the following data. I have not had much luck in figuring out what this info means. Any help would be greatly appreicated. Thanks.

DTC that caused the freeze frame: P0303
Engine RPM: 960
Load Value: 5%
MAP Sensor: 33 Kpa
Coolant Temp: 73 F
Short Term Fuel Trim1: minus 4.6%
Long Term Fuel Trim1:3.9%
Short Term Fuel Trim3: minus 12.1%
Long Term Fuel Trim3: minus 70.2%
Vehicle Speed: 1mph
Fuel System 1: CLSD
Fuel System 2: N/A

#2 JusBringIt (converted)

JusBringIt (converted)
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Posted November 3, 2010 at 06:12 pm

This means you're showing a misfire on cylinder three and your O2 sensors are telling the ECU that there is too much O2 content in the exhaust. I'm surprised you're not tripping a lean code as It would appear that you have some fuel supply issue. I'd venture to say fuel filter change if you haven't done so, possibly fuel pump. I'm inclined to believe if you drive with the light on for a while it will trip a few more codes that haven't shown themselves yet.

Any drive-ability issues? Does it hesitate at higher rpms? Is the engine stumble faintly noticeable or does it run rough? Have you recently replaced your O2 sensors?

Load value is how much % of the total engine power output is being expended.

Map sensor is at 4.9 psi which might be a bit on the low side for steady idle but isn't a number where you should be concerned about map. Idle might be slightly high. If your engine was warmed up fully when you ran the tests you might have some coolant sensor issue. When I say fully warmed up, I mean it has been running for over 5 minutes since you're only showing 73F.

Edited by JusBringIt, November 3, 2010 at 06:17 pm.


#3 Miner

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  • Active Member
  • 26 posts

Posted November 3, 2010 at 06:29 pm

2002, T&C, 3.8. Changed the plugs with OEM, wires and coil.

P0303 Code came back again. Hooked up the scan tool and received the following data. I have not had much luck in figuring out what this info means. Any help would be greatly appreicated. Thanks.

DTC that caused the freeze frame: P0303
Engine RPM: 960
Load Value: 5%
MAP Sensor: 33 Kpa
Coolant Temp: 73 F
Short Term Fuel Trim1: minus 4.6%
Long Term Fuel Trim1:3.9%
Short Term Fuel Trim3: minus 12.1%
Long Term Fuel Trim3: minus 70.2%
Vehicle Speed: 1mph
Fuel System 1: CLSD
Fuel System 2: N/A



#4 Miner

Miner
  • Active Member
  • 26 posts

Posted November 3, 2010 at 06:40 pm

Thanks for the info. It is helpful and gives me some places to look. This time the code came right as I was pulling the van out of the garage, so thus the low temp. I have not changed the fuel filter in a while, I know that the dealer changed it a while back when they had be trapped there doing warranty work, and I know the O2 sensor has not been changed. The van has about 110,000 miles. If the DTC light comes on aging I will drive it a bit and see if some other codes are tripped. As far as drivability issues, sometime it idles rough when first started for about 30 sec, but no missing or stumbling at high speeds. Thanks again.


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